实例设计模式1《策略模式》

#include <iostream>

using namespace std;

class strategy

{

public:

virtual void AlgorithmInterface() = 0;

};

class ConcreteStrategyA : public strategy

{

public:

virtual void AlgorithmInterface()

{

cout<<"算法A实现 "<<"ConcreteStrategyA :: AlgorithmInterface()方法"<<endl;

}

};

class ConcreteStrategyB : public strategy

{

public:

virtual void AlgorithmInterface()

{

cout<<"算法B实现 "<<"ConcreteStrategyB :: AlgorithmInterface()方法"<<endl;

}

};

class ConcreteStrategyC : public strategy

{

public:

virtual void AlgorithmInterface()

{

cout<<"算法C实现 "<<"ConcreteStrategyC :: AlgorithmInterface()方法"<<endl;

}

};

class Context

{

public:

Context(strategy* strate):m_strate(strate)

{

}

void ContextInterface()

{

m_strate->AlgorithmInterface();

}

private:

strategy* m_strate;

};

int main()

{

Context *context = new Context(new ConcreteStrategyA);

context->ContextInterface();

context = new Context(new ConcreteStrategyB);

context->ContextInterface();

context = new Context(new ConcreteStrategyC);

context->ContextInterface();

system("PAUSE");

return 0;

}